Malicious PDF — malware analysis report

Static analysis result for SHA-256 87613bffe095504f…

MALICIOUS

PDF

58.6 KB Created: 2021-03-22 23:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19dd2a539e9c888b551b255937461c82 SHA-1: d3fb45ac1680a68df9f2ec3d8cb476d936b9bf22 SHA-256: 87613bffe095504f393bf5e07c6338f95cc72f50804f28417fb375d1b95c0739
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, a common technique for link farming or directing users to malicious sites. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_URI', suggesting the document's primary purpose is to host a large number of external links. The ClamAV detection and ML classifier also flag it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6478

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=amass+xt60+pdf
    • https://cdn.sqhk.co/belebudetub/ihggxgj/muroviribuku.pdf
    • http://ledekajigibinad.22web.org/causative_verbs_worksheet.pdf
    • https://cdn.sqhk.co/mojupesonon/hijbggh/notes_in_music_sheet.pdf
    • https://cdn.sqhk.co/dabebasavus/idVgeRT/66443626374.pdf
    • https://cdn.sqhk.co/pekotegafod/h1aYjal/79734259806.pdf
    • https://cdn.sqhk.co/wivusaranonu/1gjAihw/tebawolowafeteda.pdf
    • https://cdn.sqhk.co/dorusafe/iihgid1/83567008039.pdf
    • https://cdn.sqhk.co/tobetusibu/dRDjhhb/merge_survival_zombies.pdf
    • https://cdn.sqhk.co/zuronenom/hiV9qpS/refaweka.pdf
    • https://uploads.strikinglycdn.com/files/8e485b04-a498-4c57-a91f-0a094e8b6c8e/bowazekigisimanom.pdf
    • https://uploads.strikinglycdn.com/files/5d14b3ca-36da-4e5a-8e7c-3042be7d9eb4/57444177647.pdf
    • http://padezaj.rf.gd/video_star_app.pdf
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_411a2702a2a34d5c9d932714f7f57c8f.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_bd9cfb0e582e4b31a89e7476d7b16492.pdf?index=true
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_d8ed445203994c799017ece8a06f9693.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea5ad6a7-f167-4073-9a7e-61aee63f5318/38943064438.pdf
    • https://uploads.strikinglycdn.com/files/d4e6123c-3681-4ece-9baa-5d4b08a0dac9/how_to_draw_anime_characters_kissing_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/598ab276-c9e4-46f9-93eb-be957f31a782/64110971122.pdf
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_70329d8e5c0c486b93d6b3930d22fbe7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7d49f48-094c-4d4b-92c7-4f3a27d44c33/nikon_p-223_3x32_rifle_scope.pdf

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